.app {
	border: 1px solid #444;
	width: 100%;
}
.main > button {
	padding: .5em;
}
.control {
	position: absolute;
	left: 0;
	right: 0;
	margin: 0 auto;
	font-size: 2em;
	width: 3em;
}
.control > a {
	text-align: center;
	position: absolute;
	text-decoration: none;
	color: #DDD;
	background: rgba(100, 100, 100, 0.5);
}
.control > .reduce, .control > .increase {
	width: 1em;
	text-align: center;
}
.control > .toright, .control > .reduce {
	right: 0;
}
.control > .tobottom, .control > .totop {
	width: 1em;
	left: 0;
	right: 0;
	margin: 0 auto;
}